Combination jolt-ramming and rock-over machine.



W. C. NORCROSS. COMBINATION 1011 RAIVIMING'AND ROCK-OVER MACHINE.

APPLICATION FILED JULY I7. 1916. 1,224,4071 Patented 11111111917.

2 SHEETS-SHEET l.

W. C. NORCROSS.

coMlNAnoN 10u RAMMlNG AND RocK.ovER MACHINE.

APPLICATION FILED 1ULY1I|I9I5- Patented May 1, 1917.

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WILLIAMC. N ORCROSS, OF TERRE HAUTE, INDIANA, ASSIGNORI TO 'MlirIEtICANl MOLD- ING MACHINE CO., OF TERRE HAUTE; INDIANA, A. CORPORATION OF INDIANA.

COMBINATION JOIiT-RAMMING AND ROCK-OVER. MACHINE.

LZZIAOY.

Application led July 17, 1916.

v To all whom t may concern:

Be it known that I, WILLIAM C. NoR- cRoss, a citizen of the United States, residing at Terre Haute, county of Vig1;,oand

State of Indiana, have invented certain new and useful Improvements in Combination Jolt-Ramming and Rock-Over Machines, ofy which the following is a specification.

rlhis invention relates to combination jolt-ramming and rock-over machines.

Machines of the general class to which my invention belongs embody an automatic joltramming machine, a drawing cylinder having a table to support the mold as it is lowered away from the pattern, rock-over means being used to tilt the rammed flask, mold, pattern and attachments to a position where the mold may be lowered away from the` pattern.

In this class of machine, as previously known to the art, difliculty has been experienced in providing a suitably level and rm bearing or support for the mold while it is being drawn from the flask and pattern for, unless supported perfectly level, there will be a tendency to distort the mold as it will not draw clear from the pattern without relative lateral movement.

The present invention provides an improved three-point-bearing leveling table or attachmentl for the drawing cylinder which is adapted to automatically adjust itself, on elevation of the piston of the drawing cylinder, by its Contact with the bottom board or the battens thereof, after the rammed mold has been rocked over and may then be securely fastened in its set or adjusted position so that when the drawing table isv lowered, the mold will draw or lower away from the pattern in a clean cut and accurate manner and all tendency to distortion is prevented. l

In rock-over machines it has been observed that justas the rock-over table with the flask, mold', pattern and attachments passes over the vertical line or center of rotation, there is usually a rapid downward swing of the rock-over table which not only tends to strain the machine, but to disarrange the flask, mold and patterny and dis- Specification of Letters Patent.

Patented May 1, 1917.

serieu No. 109,698.

turb the smoothness of operation which should occur in rocking the mold and flask from the j olt-ramming machine to the drawing cylinder'.

To overcome the foregoing defect, tliepresent invention provides .a hydraulic cushion or balancing cylinder which prevents sudden jerks or irregularity in the speed of any part of the rock-over table and is particularly .adapted to prevent the sudden jerk when the parts j )ass over the center of rotation.

Preferably, a'cylinder and piston, with, an oil cushion contained within the cylinder and adapted to flow gradually to one side or the other of the piston,` is employed for this purpose.

My invention also contemplates the provision of a simple, positive and efficient lever arrangement for accomplishing the rock-over action of the rock-over table, when the mold is to be drawn, that will permit the joltramming of the mold before the rock-over action is to occur.

My invention in its most complete form as regards the rock-over action ofthe parts, comprises the combination ofthe improved lever arrangement withy the hydraulic balancing device aforesaid.

I am aware that the rock-over lever arrangement is capable of independent use and that this mechanical movement, particularly as combined with the hydraulic balancing cylinder or device, may be employed in other machines than jolt-ramming rock-over machines; furthermore, that the improved three-point-leveling table may be provided in a rock-over machine which. did noty employ my improved lever arrangement. Consequently, while the various improvements aforesaid are peculiarly adapted' for conjoint use in a jolt-ramming rock-over machine, nevertheless, as this may be used independently, I do not limit myself to their conjoint use except as specified in the appended' claims.

In the accompanying drawings:

Figure 1 is a side elevation, certain parts being in section, dotted lines representing the rocked-over position of the rock-over table and the elevated position of the drawing, automatically leveling table;

Fig. 2, a plan view; and

Fig 3 a detail view of the leveling device.

There is a base 1 common to the jolt-ramming machine 2 and mold drawing device 37.

rlhe jolt-ramming machine 2 may be of the kind set forth in my Patent No. 1,031,084, dated July 2, 1912, or, like the machine of my Patent No. 1,194,059, dated August 8, 1916, the latter being shown.

The cylinder` of machine 2 has an inlet 4 and exhaust 5 leading to chambers 6, 7, respectively. The latter communicates by ports 9, 10, with chamber 11 in piston head 12 and under the control of valve 13 admit air to the cylinder of machine 2 below piston head 12, or exhaust it therefrom. The valve is seated by the spring-pressed device 14 and is kicked up by the chair 15, or, down by the shoulder 16 on the piston.

Suitable valves control the admission of air into port 4 and its exhaust through port 5.

The jolting table 17 is carried;,by the head 18 of the piston 19 and is provided with cast-on brackets or arms 20.

Resting upon the jolting table 17 is the rock-over table 21 which 1s normally kept down on the table 17 by the weight of the flask and its contents but, being separate from said table, is adapted to be elevated and rocked over.

The table 21 has brackets or arms 22 provided with pins or studs 23 and pivoted to arms 20 at 22a.

Pivoted to the bed 1 at 24 are levers 25 whose free upper ends 26 have a vertical slot 27 which receives the stud 23.

Pivoted to the base 1 at 28 is a cylinder 29 in which is piston 30 having port 31. Pivoted to lever at 32 is a pistonrod 33 to which piston is attached. The cylinder head and gland 34 may be of any preferred form and a filling opening provided in the former at 35 which is closed by screw plug 36. By preference the liquid within cylinder 29 is oil to insure a relatively sluggish movement of the rock-over table 21 when the latter is being rocked over, particularlyy when said table is passing from a vertical position to an inverted position as it is this portion of the rock-over movement during which the Weight of the table, flask, mold and attachments tends to cause a sudden jerk or drop with incident strain and tendency to derangement. On the lowering of the table 21 and flask and mold, the hydraulic cylinder 29 and piston 30 insure a gradual descent to the final dotted line position, as at other times.

The drawing cylinder 37 and piston 38 operating therem may be of any preferred form and operated and controlled as desired.

The table 39, which is carried bythe piston 38, has a depending flange or apron 40 provided with a relatively large hole or opening 41. Integral with, or rigidly secured to, the table 39 is an upwardly extending stud or pin 42 having a coned tip 43.

A supplemental table or three-point leveling device 44, of general Y-shape, disposed above table 39 has a socket 45 provided with a coned countersink 46. The socket 45 is of considerably greater diameter than the pin 42 and the countersink 46 is larger than coned tip 43. The pivot central bearing thus vprovided for the leveling device 44 supports it above drawing table 39 with an adaptability for tilting in any direction so that it may automatically adjust itself to the bottom board, or battens thereon, which hold the inverted flask and mold in the dotted line position, after being rocked over, when the piston 38 is elevated.

Secured to two of the arms 47 of the Y- shaped leveling device 44 by bolts 48, is a depending yoke 49 which carries a bolt 50 extending through the large opening 41 in apron 40. A large washer 51 on the bolt lies between the head of the bolt 5,0 and apron 40 and is adapted to bear against the latter; a nut and washer on the bolt bear against the outer face of the yoke 49. Adjustment of the bolts 48, if necessary, or merely loosening bolt 50, will permit any desired upward or downward tilting of the forked end of the Y-shaped leveling device 44, the play of the bolt in hole 41 allowing such tilting. Tilting of the leveling device 44 at right-angles to the foregoing described movement, requires no adjustment of the bolts 48 but is allowed by the lateral play of bolt 50 in hole 41. The leveling device 44, freed for tilting, will automatically conform itself to the level of the bottom board or battens thereon when it is run up by elevating the piston 38. Bolt 50 is then tightened (also bolts 48, if necessary) and the bottom or follow board may be released, allowing the mold to be drawn from the pattern without danger of distorting the mold.

Suitable means may bev provided to hold the rock-over table 21 in proper relation to the drawing cylinder after the mold has been rocked over. One such means may consist of extensions or stops 52 on the hinges of the rock-over table to contact with the hinges of the jolting table, abutment screws 52a being carried by stops 52.

The pattern board, pattern and flask are placed on the rock-over table 21 and filled with sand. Air being admitted to port 4,

the piston 19 rises and falls, causing the controlling valve 13 to be kicked to and fro to alternately open and cut off the air supply, the air exhausting through port 5. The mold having been jolt-rammed to a suflicient degree to bring the sand to the desired density,

a follow or bottom board is placed on top the rammed mold andthe par-ts'clamped to 5table 21. The eXhaust valve is then closed and air pressure admitted through port 4, whereupon the piston 19 continues to rise, carrying upward the tables 17, 21, and iask, mold and pattern until the pin 23 engages the upper end of slot 27. The pin 23 then acts as a fulcrum -so that, on further rise of the piston, the lever 25 begins to swing and thearm or bracket 22 turns on the pivotal connection 22a between arms 2O and 22, the table 21 then swinging free of the table 17. The movement continuing, the table 21 and flask, mold, pattern, and follow board are completely inverted as shown by dotted lines, being arrested by the stop device 52. IVhen the table 21 arrives at the dead center, the load carried thereby, carries it over and the air is then exhausted from the cylinder of machine 2 by opening the valve controlling exhaust port 5 to allow piston 19 to descend so that the rock-over movement may be completed.

The fluid in cylinder 29 slowly flows through po-rt 31 from one side of the piston 30 to the other side thereof in a more or less sluggish manner, particularly if it is oil and thereby prevents too rapid movement of the parts during the roclrover movement.

During the ramming of the mold, the pin 23 plays freely up and down in the slot 27 which is of sutlicient length to permit the necessary amplitude of vibration.

Having rocked the table over, the piston 38 is run up to cause the leveling device 44 to adjust itself to the bottom board of the mold and said leveling device is then fastened in adjusted position. The follow or bottom board is then unclamped and the mold lowered away by allowing the piston 38 to descend. l

A reversal of the above operations returns the rock-over table 2l to normal position on the jolt-table 17.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. In a combination jolt-ramming and rock-over machine, a rock-over table, a rockable lever operatively connected thereto adapted to cause the table to rock over, and an elastic check or cushion coperating with said lever.

2. In a combination jolt-ramming and rock-over machine, a rock-over table, a rockable lever operatively connected thereto adapted to cause the table to rock over, and a piston-and-cylinder fluid check or cushion coperating with said lever.

3. In a combination jolt-ramming and rock-over machine, a jolting device, a rockover table supported thereby and movable therewith for the purpose of ramming the mold, rock-over means for causing the rocklas rover table to rise from the j olting device and toturn over, and a fluid check or cushion cooperating with said rock-over means.

over table and the jolting device, and rockover means for causing the roclcover table to rise from the jolting device and to turn over.

5. In a combination jolt-ramming and rock-over machine, a jolting device, a rockover table supported thereby and movable therewith for the purpose of ramming the mold, a pivotal connection between the roclover table and the jolting device, and rock over means for causing the rock-over table to rise from the jolting device and to turn over when the jolting device is elevated beyond its normal upward movement.

6. In a combination jolt-ramming and rock-over machine, a jolting device, a rockover table supported thereby and movable.

therewith for the purpose of ramming the mold, a pivotal connection between the rockover table and the jolting device, and a lever pivoted to the rock-over table adapted to permit normal vibration of the jolting device and table in unison for the purpose of ramming the mold, said lever causing the rock-over table to turn over when the jolting device is elevated beyond its normal upward movement. n

7. In a combination jolt-ramming and rock-over machine, a jolting device, a rockover table supported thereby and movable therewith for the purpose of ramming the mold, a pivotal connection between the rockover table and the jolting device, a lever pivoted to the rock-over table adapted to permit normal vibration of the jolting device and table in unison for the purpose of ramming the mold, said lever causing the rock-over table to turn over when the jolting device is elevated beyond its normal upward movement, and a fluid check or cushion cooperating with said lever.

8. In a mechanical movement, the combination with a jolting device and a rock-over table, of a pivotal connection therebetween, and a pivoted lever having a pivotal connection with said table, whereby when the table is moved beyond its normal position, the leverwill rock said table over.

9. In a mechanical movement, the combination with a jolting device and a rock-over table, of a pivotal connection therebetween, a pivoted lever having a pivotal connection with said table, whereby when the table is moved beyond its normal position, the lever will rock said table over, and a fluid check coperating with said lever.

l0. In a mechanical movement, the combination With a jolting device and a rook-over whereby movement of the table beyond a, table adapted for movement as a unit predetermined position will cause it to rise Within predetermined limits, arms carried and rock over. 10 by the jolting device and rock-over table In testimony whereof I hereunto ailx my which are pivoted together, one of said arms signature.

having a crank, and a pivoted lever having a loose connection With said cranked arm, WILLIAM C. NORCROSS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

